Saints coach Sean Payton, who announced the additions to his staff on Saturday, said the Saints found Ryan's defenses challenging when they played his previous teams. In 2010, Ryan was Cleveland's defensive coordinator when the Browns beat the Saints in the Superdome, 30-17, intercepting passes by Drew Brees four times.

Ryan, the brother of Jets coach Rex Ryan, spent the past two seasons as Dallas' defensive coordinator and was fired after last season, when his defense ranked 19th.

Ryan said joining the Saints is a "great opportunity" and he's getting started right away. Kwan has been an NFL assistant 23 years, the past three in Buffalo.

Gen. David Petraeus pleaded guilty to federal charges Tuesday to end a probe into whether he provided classified information to his mistress when he was CIA director, according to a U.S. official briefed on the matter.